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<h2>
<span class="refentrytitle">gainslider</span>
</h2>
<p>gainslider —
An implementation of a logarithmic gain curve which is similar to the gainslider~ object from Cycling 74 Max / MSP.
</p>
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<div class="refsect1">
<a id="idm281472927848776"></a>
<h2>Description</h2>
<p>
This opcode is intended for use to multiply by an audio signal to give a console mixer like feel. There is no bounds in the
source code so you can for example give higher than 127 values for extra amplitude but possibly clipped audio.
</p>
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<div class="refsect1">
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<h2>Syntax</h2>
<pre class="synopsis">kout <span class="command"><strong>gainslider</strong></span> kindex</pre>
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<div class="refsect1">
<a id="idm281472927844872"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kindex</em></span> -- Index value. Nominal range from 0-127. For example a range of 0-152 will give you a range from -∞ to +18.0 dB.
</p>
<p>
<span class="emphasis"><em>kout</em></span> -- Scaled output.
</p>
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<h2>Examples</h2>
<p>
Here is an example of the gainslider opcode. It uses the file <a class="ulink" href="examples/gainslider.csd" target="_top"><em class="citetitle">gainslider.csd</em></a>.
</p>
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<a id="idm281472927840376"></a>
<p class="title">
<strong>Example 370. Example of the gainslider opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<div class="refsect1">
<a id="idm281472757983112"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in Silent</span>
-odac -iadc -d <span class="c1">;;;realtime output</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">48000</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">100</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; gainslider test</span>
<span class="c1">; uncomment for realtime midi</span>
<span class="c1">;kmod ctrl7 1, 1, 0, 127</span>
<span class="c1">; uncomment for non realtime</span>
k<span class="n">m0d</span> <span class="nb">phasor</span> <span class="mi">1</span><span class="o">/</span><span class="mi">10</span>
k<span class="n">mod</span> <span class="nb">scale</span> k<span class="n">m0d</span><span class="p">,</span> <span class="mi">127</span><span class="p">,</span> <span class="mi">0</span>
k<span class="n">out</span> <span class="nb">gainslider</span> k<span class="n">mod</span>
<span class="nb">printks</span> <span class="s">"kmod = %f kout = %f</span><span class="se">\\</span><span class="s">n"</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> k<span class="n">mod</span><span class="p">,</span> k<span class="n">out</span>
a<span class="n">out</span> <span class="nb">diskin2</span> <span class="s">"fox.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
a<span class="n">out</span> <span class="o">=</span> a<span class="n">out</span><span class="o">*</span>k<span class="n">out</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">30</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472927836136"></a>
<h2>See Also</h2>
<p>
<a class="link" href="scale.html" title="scale"><em class="citetitle">scale</em></a>,
<a class="link" href="logcurve.html" title="logcurve"><em class="citetitle">logcurve</em></a>,
<a class="link" href="expcurve.html" title="expcurve"><em class="citetitle">expcurve</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472927832104"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: David Akbari</td>
</tr>
<tr>
<td>October</td>
</tr>
<tr>
<td>2006</td>
</tr>
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</p>
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